The Catholic Church in New Zealand is part of the worldwide Catholic Church under the leadership of the Pope in Rome, assisted by the Roman Curia, and with the New Zealand bishops.

The Metropolitan Cathedral of the Sacred Heart and of Saint Mary His Mother, better known as Sacred Heart Cathedral, is a Roman Catholic cathedral church on Hill Street, Wellington, New Zealand. It is the parish church of the Thorndon Catholic parish and the seat of the Archbishop of Wellington. The New Zealand Parliament is a close neighbour of the cathedral. However, the Thorndon Catholic parish predates that institution. The cathedral is part of a Catholic precinct which includes: St Mary's College; Sacred Heart Cathedral School; St Mary's Convent, the motherhouse of the Sisters of Mercy in Wellington; the Catholic Centre, in which Catholic administration is located; and Viard House, which is both the cathedral parish presbytery and the residence of the archbishop.